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listdensityplot, black box?


I have a rectangular grid of data (249x400) in the simple form of
values 0/1, e.g:
{{1, 1, 0, ......, 1, 1, 1, 0, 0, 0, 0}, ... }

I read them with

- lab=Import["...image.pbm"]

- lab2 = lab[[1, 1]]

and Show[Graphics[Raster[lab2]]] shows the image OK.

Now, whenever I do:

- ListDensityPlot[lab2]

I get no errors, but a completely black plot - of the correct size
249x400, however.

I played a little with ColorFunction and ColorOutput, but it didnt
help.

Do you have any idea what I'm doing wrong???

thanks for any help...


Alessandro Magni



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